What are the principles of spur gear design?
What are the principles of spur gear design?
• Apply principles learned in Chapter 11 to actual design and selection of spur gear systems. •Calculate forces on teeth of spur gears, including impact forces associated with velocity and clearances. •Determine allowable force on gear teeth, including the factors necessary due to angle of involute of tooth shape and materials selected for gears.
How do you calculate force on spur gears?
•Calculate forces on teeth of spur gears, including impact forces associated with velocity and clearances. •Determine allowable force on gear teeth, including the factors necessary due to angle of involute of tooth shape and materials selected for gears.
Which is spur gear in a washing machine?
SPUR GEARSPUR GEAR • Teeth is parallel to axis of rotation • Transmit power from one shaft to another parallel shaft • UdiUsed in El ti diElectric screwdriver, oscillating sprinkler, windup alarm clock, washing machine and clothes dryer External and Internal spur Gear…External and Internal spur Gear…
What are the forces on spur gear teeth?
Forces on spur gear teeth •Ft= Transmitted force •Fn= Normal force or separating force •Fr= Resultant force • θ= pressure angle •Fn= Fttan θ cosθ F Ft r= P N RAO 5 Forces on spur gear teeth • Power, P; or • Torque, T = Ftr and r = Dp/2 • Combining the above we can write 63,000 T n P = p tD 2 T F = n 63,000 P T = P N RAO 6
How many RPM does a 20 tooth spur gear transmit?
• 20-tooth, 8 pitch, 1-inch-wide, 20° pinion transmits 5 hp at 1725 rpm to a 60-tooth gear. • Determine driving force, separating force, and maximum force that would act on mounting shafts. Example Problem 12-1: Forces on Spur Gear Teeth P N RAO 8 − Find transmitted force: (12-3) Ft= 2T Dp Ft = (2)183 in-lb 2.5 in = 146 lb